Bill O'Brien says he's handing over playcalling duties for the Houston Texans to offensive coordinator Tim Kelly next season.

"[Kelly is] a really bright guy," O'Brien said. "He's a really good coach. Players really respect him. He just does a great job. Great knowledge of the whole offense from the passing game to the running game."

O'Brien had been calling the offensive plays since he took the role over from former offensive coordinator George Godsey in September 2016. He was given the additional title of general manager in January.

Kelly is headed into second season as Houston's offensive coordinator.

With the new NFL year a little more than a month away (March 18), here is a look at the 10 teams with the most cap space.

The numbers are based on a salary cap of $200 million.

1. Miami Dolphins - $89.3 million

2. Indianapolis Colts - $86.2 million

3. Buffalo Bills - $80.2 million

4. Tampa Bay Buccaneers - $79.9 million

5. Dallas Cowboys - $77.2 million

6. Denver Broncos - $61.9 million

7. New York Giants - $61.9 million

8. Houston Texans - $55.2 million

9. Las Vegas Raiders - $54.9 million

10. Arizona Cardinals - $53.7 million